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Rev 2071 Rev 2606
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# The handlers call exc_dispatch().
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# The handlers call exc_dispatch().
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#
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#
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.macro handler i n
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.macro handler i n
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	/*
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	/*
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	 * Choose between version with error code and version without error code.
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	 * Choose between version with error code and version without error
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	 * Both versions have to be of the same size. amd64 assembly is, however,
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	 * code. Both versions have to be of the same size. amd64 assembly is,
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	 * a little bit tricky. For instance, subq $0x80, %rsp and subq $0x78, %rsp
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	 * however, a little bit tricky. For instance, subq $0x80, %rsp and
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	 * can result in two instructions with different op-code lengths.
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	 * subq $0x78, %rsp can result in two instructions with different
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	 * op-code lengths.
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	 * Therefore we align the interrupt handlers.
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	 * Therefore we align the interrupt handlers.
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	 */
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	 */
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	.iflt \i-32
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	.iflt \i-32
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		.if (1 << \i) & ERROR_WORD_INTERRUPT_LIST
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		.if (1 << \i) & ERROR_WORD_INTERRUPT_LIST
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interrupt_handlers:
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interrupt_handlers:
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h_start:
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h_start:
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	handler 0 IDT_ITEMS
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	handler 0 IDT_ITEMS
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h_end:
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h_end:
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## Low-level syscall handler
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#
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# Registers on entry:
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#
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# @param rcx		Userspace return address.
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# @param r11		Userspace RLFAGS.
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#
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# @param rax		Syscall number.
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# @param rdi		1st syscall argument.
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# @param rsi		2nd syscall argument.
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# @param rdx		3rd syscall argument.
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# @param r10		4th syscall argument. Used instead of RCX because the
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#			SYSCALL instruction clobbers it.
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# @param r8		5th syscall argument.
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# @param r9		6th syscall argument.
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#
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# @return		Return value is in rax.
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#
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syscall_entry:
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syscall_entry:
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	# Switch to hidden gs
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	swapgs			# Switch to hidden gs
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	swapgs
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	#
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	# %gs:0 now points to pointer to stack page
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	# %gs:0			Scratch space for this thread's user RSP
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	mov %gs:0, %r10     # We have a ptr to stack page in r10
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	# %gs:8			Address to be used as this thread's kernel RSP
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	addq $PAGE_SIZE-16, %r10 # We need some space to store old %sp
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	#
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	movq %rsp, 0(%r10)  # Save old stack pointer to stack
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	movq %rsp, %gs:0	# Save this thread's user RSP
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	movq %r10, %rsp     # Change to new stack
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	movq %gs:8, %rsp	# Set this thread's kernel RSP
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	pushq %rcx          # Return address
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	pushq %r11          # Save flags
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	# Switch back to remain consistent
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	swapgs			# Switch back to remain consistent
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	swapgs
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	sti
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	sti
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	movq %r9, %rcx      # Exchange last parameter as a third
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	pushq %rcx
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	pushq %r11
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	movq %r10, %rcx		# Copy the 4th argument where it is expected
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	pushq %rax
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	call syscall_handler
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	call syscall_handler
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	cli                 # We will be touching stack pointer
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	addq $8, %rsp
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	popq %r11
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	popq %r11
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	popq %rcx
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	popq %rcx
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	cli
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	swapgs
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	movq 0(%rsp), %rsp
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	movq %gs:0, %rsp	# Restore the user RSP
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	swapgs
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	sysretq
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	sysretq
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.data
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.data
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.global interrupt_handler_size
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.global interrupt_handler_size
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interrupt_handler_size: .quad (h_end-h_start)/IDT_ITEMS
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interrupt_handler_size: .quad (h_end-h_start)/IDT_ITEMS